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United States Patent | 5,731,988 |
Zandi ,   et al. | March 24, 1998 |
A method and apparatus for performing color conversion on image data provided as a plurality of vectors representing a datum of the image. The present invention provides a forward transform that performs reversible color conversion on the plurality of vectors, such that the transform is reversible in integer arithmetic with predictable precision.
Inventors: | Zandi; Ahmad (Cupertino, CA); Schwartz; Edward L. (Sunnyvale, CA) |
Assignee: | Richo Company, Ltd. (Tokyo, JP); Richo Corporation (Menlo Park, CA) |
Appl. No.: | 436662 |
Filed: | May 8, 1995 |
Current U.S. Class: | 382/167; 348/391.1; 358/518; 382/244 |
Intern'l Class: | H03M 007/00; H03M 007/30 |
Field of Search: | 364/526,604,731,736,745,715.02,725 382/244,253,167 348/391,395,577 358/518,521,523 345/136,137 |
4510578 | Apr., 1985 | Miyaguchi et al. | 364/725. |
5293258 | Mar., 1994 | Dattilo | 358/518. |
5343311 | Aug., 1994 | Morag et al. | 358/518. |
5416614 | May., 1995 | Crawford | 345/154. |
TABLE 1 ______________________________________ LSB (U.sub.rev) LSB (V.sub.rev) Lookup Value G ______________________________________ 0 0 0 Y.sub.rev + (U.sub.rev + 0)/2 1 0 1 Y.sub.rev + (U.sub.rev + 1)/2 0 1 2 Y.sub.rev + (U.sub.rev + 2)/2 1 1 1 Y.sub.rev + (U.sub.rev + 1)/2 ______________________________________
______________________________________ RGB YUV ______________________________________ 111 100 221 101 121 110 120 111 222 200 211 111 ______________________________________